Proposing

[Fragony]

good luck

[el_slapper]

Well, for me it was rather unromantic, just came naturally in the discussion that we were going to get married, and it immediatly went technical(as marrying a foreigner is a lot of papers). At least, no problem wondering how to ask the question. As it will seemingly not happen to you, I cannot you give you specific advice.

Though as you must know her rather well, I'd say like above : choose a moment when you know she will be open-minded & happy.

[Beskar]

Also know that she will say yes.

I would also recommend living together before marrying as well, not the typical US method of getting married then living together and find out you can't even stand it.